3943644 has 12 divisors (see below), whose sum is σ = 9201864. Its totient is φ = 1314544.

The previous prime is 3943637. The next prime is 3943651. The reversal of 3943644 is 4463493.

It is an interprime number because it is at equal distance from previous prime (3943637) and next prime (3943651).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164307 + ... + 164330.

It is an arithmetic number, because the mean of its divisors is an integer number (766822).

Almost surely, 2^3943644 is an apocalyptic number.

It is an amenable number.

3943644 is an abundant number, since it is smaller than the sum of its proper divisors (5258220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3943644 is a wasteful number, since it uses less digits than its factorization.

3943644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328644 (or 328642 counting only the distinct ones).

The product of its digits is 31104, while the sum is 33.

The square root of 3943644 is about 1985.8610223276. The cubic root of 3943644 is about 157.9910799857.

The spelling of 3943644 in words is "three million, nine hundred forty-three thousand, six hundred forty-four".